1. The hydrodealkylation of toluene (C7H8) is a process used to produce benzene (C6H6). The main reaction in the process is: C7H8+ H₂- C6H6 + CH4 The process operates at an overall conversion of 90% Toluene and is run with a recycle stream that contains 8 mol% of unreacted toluene. However, there is a side reaction that produces unwanted biphenyl [(C6H5)2]: 2 C6H6 (C6H5)2 + H₂ The homogeneous reactions take place in the 600°C range and a pressure of about 35 bar. The fresh feed to process contains 1000 mol/h of toluene and 800 mol/h of hydrogen to prevent coking in which raw material of toluene and hydrogen are combined with a recycle stream that contains hydrogen and toluene. The product stream leaving the reactor contains hydrogen, methane, benzene, toluene, and unwanted biphenyl. This stream is fed into a separation train in which a stream of toluene, hydrogen, and methane is removed from the benzene and biphenyl. A fraction of this stream is purged while the remainder is recycled back to the reactor in a ratio of 3 moles of recycle to 1 mole fresh feed. The produce stream consists of all the benzene and biphenyl which will be recovered as a byproduct. a. Draw a process flow diagram of the process above, assigning variables to all unknown flow rates and/or compositions. Perform a degree of freedom analysis on all the overall process and all subsystems.
1. The hydrodealkylation of toluene (C7H8) is a process used to produce benzene (C6H6). The main reaction in the process is: C7H8+ H₂- C6H6 + CH4 The process operates at an overall conversion of 90% Toluene and is run with a recycle stream that contains 8 mol% of unreacted toluene. However, there is a side reaction that produces unwanted biphenyl [(C6H5)2]: 2 C6H6 (C6H5)2 + H₂ The homogeneous reactions take place in the 600°C range and a pressure of about 35 bar. The fresh feed to process contains 1000 mol/h of toluene and 800 mol/h of hydrogen to prevent coking in which raw material of toluene and hydrogen are combined with a recycle stream that contains hydrogen and toluene. The product stream leaving the reactor contains hydrogen, methane, benzene, toluene, and unwanted biphenyl. This stream is fed into a separation train in which a stream of toluene, hydrogen, and methane is removed from the benzene and biphenyl. A fraction of this stream is purged while the remainder is recycled back to the reactor in a ratio of 3 moles of recycle to 1 mole fresh feed. The produce stream consists of all the benzene and biphenyl which will be recovered as a byproduct. a. Draw a process flow diagram of the process above, assigning variables to all unknown flow rates and/or compositions. Perform a degree of freedom analysis on all the overall process and all subsystems.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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![1. The hydrodealkylation of toluene (C7H8) is a process used to produce benzene (C6H6). The main
reaction in the process is:
C7H8 + H₂ C6H6 + CH4
The process operates at an overall conversion of 90% Toluene and is run with a recycle stream that
contains 8 mol% of unreacted toluene. However, there is a side reaction that produces unwanted
biphenyl [(C6H5)2]:
2 C6H6 →
(C6H5)2 + H2
The homogeneous reactions take place in the 600°C range and a pressure of about 35 bar.
The fresh feed to process contains 1000 mol/h of toluene and 800 mol/h of hydrogen to prevent coking
in which raw material of toluene and hydrogen are combined with a recycle stream that contains
hydrogen and toluene. The product stream leaving the reactor contains hydrogen, methane, benzene,
toluene, and unwanted biphenyl. This stream is fed into a separation train in which a stream of toluene,
hydrogen, and methane is removed from the benzene and biphenyl. A fraction of this stream is purged
while the remainder is recycled back to the reactor in a ratio of 3 moles of recycle to 1 mole fresh feed.
The produce stream consists of all the benzene and biphenyl which will be recovered as a byproduct.
a. Draw a process flow diagram of the process above, assigning variables to all unknown flow rates
and/or compositions. Perform a degree of freedom analysis on all the overall process and all
subsystems.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4d2c5273-c3db-4d3a-84b6-e5e4be0e5fd5%2F37230a52-9724-4fe4-b425-23d6de04f5b5%2Fbkflqmn_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. The hydrodealkylation of toluene (C7H8) is a process used to produce benzene (C6H6). The main
reaction in the process is:
C7H8 + H₂ C6H6 + CH4
The process operates at an overall conversion of 90% Toluene and is run with a recycle stream that
contains 8 mol% of unreacted toluene. However, there is a side reaction that produces unwanted
biphenyl [(C6H5)2]:
2 C6H6 →
(C6H5)2 + H2
The homogeneous reactions take place in the 600°C range and a pressure of about 35 bar.
The fresh feed to process contains 1000 mol/h of toluene and 800 mol/h of hydrogen to prevent coking
in which raw material of toluene and hydrogen are combined with a recycle stream that contains
hydrogen and toluene. The product stream leaving the reactor contains hydrogen, methane, benzene,
toluene, and unwanted biphenyl. This stream is fed into a separation train in which a stream of toluene,
hydrogen, and methane is removed from the benzene and biphenyl. A fraction of this stream is purged
while the remainder is recycled back to the reactor in a ratio of 3 moles of recycle to 1 mole fresh feed.
The produce stream consists of all the benzene and biphenyl which will be recovered as a byproduct.
a. Draw a process flow diagram of the process above, assigning variables to all unknown flow rates
and/or compositions. Perform a degree of freedom analysis on all the overall process and all
subsystems.
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